Network Connectivity is Google's suite of products that provide enterprise connectivity from your on-premises network or from another cloud provider to your Virtual Private Cloud (VPC) network.
Securely extends your peer network to Google's network through an IPsec VPN tunnel.
Extends your on-premises network to Google's network through a highly available, low latency connection. You can use Dedicated Interconnect to connect directly to Google, or use Partner Interconnect to connect to Google through a supported service provider.
Uses the Border Gateway Protocol (BGP) to dynamically exchange routes between your VPC network and on-premises networks when you use Cloud VPN or Cloud Interconnect.
Network Connectivity Center
Network Connectivity Center lets you use a hub-and-spoke architecture for network connectivity management. With this architecture, you can conduct data transfer between your sites. Network Connectivity Center also includes the Router appliance feature, which lets you use a third-party network virtual appliance to establish site-to-site or site-to-cloud connectivity.